Fostex T50RPmk4
Fostex T50RPmk4
Fostex T50RPmk4
Fostex T50RPmk4
Fostex T50RPmk4

FOSTEX

Fostex T50RPmk4

€199,02

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SKU: 59491
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Pickup available at Warsaw Showroom

Fostex T50RPmk4

Warsaw Showroom

Pickup available, usually ready in 24 hours

Nowogrodzka 6
102
00-513 Warszawa
Poland

+48573580840

Contact
Fostex T50RPmk4 is the fourth generation of the T50RP — one of the longest-running planar magnetic driver platforms in audio, used in studio monitoring environments since 1974. The mk4 is the first generation with a fully redesigned RP driver since the transition to the mk3: new printed coil pattern, increased magnet count, rebuilt magnetic circuit, and a new symmetrical housing with sockets on both sides. Impedance dropped to 28 Ω while sensitivity increased to 97 dB/mW.

What changed in the fourth-generation driver

The third-generation RP driver ran for nearly 20 years — from the mk3 in 2015 through the mk4's 2024 debut. The generational difference is substantially deeper than the mk2-to-mk3 transition, which was primarily a tuning revision on the same driver geometry. The mk4 introduces a redesigned printed coil trace pattern that expands and equalizes the diaphragm vibration area, increased magnet count sandwiching the diaphragm for stronger controlled drive, optimized magnetic flux distribution eliminating self-resonance modes, and a completely new housing geometry. The electrical result is measurable: impedance dropped from 50 Ω (mk3) to 28 Ω, and sensitivity rose from 91 dB/mW to 97 dB/mW — the mk4 drives adequately from an audio interface or portable source without a dedicated headphone amplifier, whereas the mk3 required substantial output voltage in the same context. Frequency response extends to 10 Hz – 40,000 Hz, compared to 15 Hz – 35,000 Hz on the mk3.

New cable topology and balanced connectivity

Previous T50RP generations used a left-cup-only proprietary connector. The mk4 introduces a 4-pole 3.5 mm TRRS socket on both earcups — the cable connects on either side with no tonal difference. Symmetrical housing eliminates the acoustic L/R asymmetry caused by differing internal structures between sides. The 4-pole socket is balanced-capable from the factory — optional balanced cables ET-RP2.5BL (2.5 mm), ET-RP4.4BL (4.4 mm), and ET-RPXLR connect without adapters. The T50RPmk4 retains its status as a modding platform: ear pad swaps, internal damping modifications, and acoustic tuning remain viable, with a significantly higher stock performance baseline than the mk3.

KEY FEATURES

  • 4th-generation RP driver — new coil trace pattern, increased magnets, optimized magnetic circuit
  • 28 Ω impedance / 97 dB/mW sensitivity — drives from audio interfaces and portable sources without a dedicated amplifier
  • Frequency response 10 Hz – 40,000 Hz — extended vs mk3 (15 Hz – 35,000 Hz)
  • Symmetrical housing with bilateral 4-pole TRRS 3.5 mm sockets — no L/R acoustic asymmetry
  • Balanced-capable out of the box — compatible with ET-RP2.5BL, ET-RP4.4BL, ET-RPXLR balanced cables
  • Semi-open design — acoustically unified with T50RPmk4CL closed-back platform
  • Low-rebound circumaural ear pads — optional Ultrasuede EX-EP-RP60 available separately

TECHNICAL SPECIFICATIONS

  • Model: T50RPmk4
  • Driver type: Planar magnetic RP (Regular Phase), 4th generation
  • Design: Semi-open
  • Impedance: 28 Ω
  • Sensitivity: 97 dB/mW
  • Frequency response: 10 Hz – 40,000 Hz
  • Maximum input power: 3,000 mW
  • Earcup connectors: 4-pole 3.5 mm TRRS (symmetrical bilateral)
  • Weight: approx. 330 g (without cable)
  • Included accessories: OFC cable 3.5 mm (4-pole to 3-pole, 2 m), 3.5 mm to 6.3 mm adapter

Returns

We want you to be sure of your choice and that the goods fit 100%.

For this reason, you have 30 days to test the product, during which you can return it without giving a reason.

It is important to keep the factory appearance of the goods, consumer properties and full equipment (original packaging, labels, manuals, software CDs, all inserts, everything that was included in the delivery).

If you have decided to return the goods, please write to us at return@wiredtunes.pl, after which we will contact you and inform you about the next steps of the procedure.

Please note that refunds are not available for:

  • Cables and connectors
  • Software
  • Devices with a used voucher and serial numbers for which they were registered
  • Custom accessories (earbuds, earbuds)
  • Needles and cartridges
  • Care and hygiene products

Returns

We want you to be sure of your choice and that the goods fit 100%.

For this reason, you have 30 days to test the product, during which you can return it without giving a reason.

It is important to keep the factory appearance of the goods, consumer properties and full equipment (original packaging, labels, manuals, software CDs, all inserts, everything that was included in the delivery).

If you have decided to return the goods, please write to us at return@wiredtunes.pl, after which we will contact you and inform you about the next steps of the procedure.

Please note that refunds are not available for:

  • Cables and connectors
  • Software
  • Devices with a used voucher and serial numbers for which they were registered
  • Custom accessories (earbuds, earbuds)
  • Needles and cartridges
  • Care and hygiene products

Warranty

We care about our customers and carefully select the producers and products that we present in Wired Tunes, which is why we are sure of their quality. If the product does not meet our standards, you will not find our catalog on the list.

Our warranty is 36 months for all products and 60 months for ADAM Audio products.

Except for consumables, strings, tubes and crossfaders, and products showing signs of misuse.

In the event of damage, please contact us via support@wiredtunes.pl, after which we will contact you and inform you about the next steps of the procedure.

If the product cannot be repaired, it will be replaced with a new one, or in the absence of an available model, we will replace it with an analogous one in the same price range or refund the entire amount that has been paid. The most important thing is that the product is used properly.

Warranty

We care about our customers and carefully select the producers and products that we present in Wired Tunes, which is why we are sure of their quality. If the product does not meet our standards, you will not find our catalog on the list.

Our warranty is 36 months for all products and 60 months for ADAM Audio products.

Except for consumables, strings, tubes and crossfaders, and products showing signs of misuse.

In the event of damage, please contact us via support@wiredtunes.pl, after which we will contact you and inform you about the next steps of the procedure.

If the product cannot be repaired, it will be replaced with a new one, or in the absence of an available model, we will replace it with an analogous one in the same price range or refund the entire amount that has been paid. The most important thing is that the product is used properly.

Fast Delivery

All orders placed on our online store are delivered using the following delivery methods:

  • DPD Courier
  • UPS Courier
  • GLS Courier
  • DB Schenker

For orders valued up to 250 EUR, the delivery cost:

  • 15 euros: Germany, Belgium, Czechia, Hungary, Latvia, Luxembourg, Austria
  • 20 euros: Italy, Denmark, Estonia, France, Lithuania, Netherlands, Romania, Slovakia
  • 30 euros: Bulgaria, Croatia, Cyprus, Finland, Greece, Ireland, Malta, Portugal, Slovenia, Spain

For orders above 250 EUR, delivery is free.

The delivery time is typically 7 days.

For oversized orders, we use carriers such as DPD, GLS, and DB Schenker. The store manager will provide information on the cost and delivery time when your order is accepted.

Fast Delivery

All orders placed on our online store are delivered using the following delivery methods:

  • DPD Courier
  • UPS Courier
  • GLS Courier
  • DB Schenker

For orders valued up to 250 EUR, the delivery cost:

  • 15 euros: Germany, Belgium, Czechia, Hungary, Latvia, Luxembourg, Austria
  • 20 euros: Italy, Denmark, Estonia, France, Lithuania, Netherlands, Romania, Slovakia
  • 30 euros: Bulgaria, Croatia, Cyprus, Finland, Greece, Ireland, Malta, Portugal, Slovenia, Spain

For orders above 250 EUR, delivery is free.

The delivery time is typically 7 days.

For oversized orders, we use carriers such as DPD, GLS, and DB Schenker. The store manager will provide information on the cost and delivery time when your order is accepted.